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/*
This file is part of jellything (https://codeberg.org/metamuffin/jellything)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2025 metamuffin <metamuffin.org>
*/
use log::debug;
use rocket::{
http::{Header, Status},
response::{self, Responder},
Request, Response,
};
use std::{
hash::{DefaultHasher, Hash, Hasher},
os::unix::fs::MetadataExt,
path::Path,
};
use tokio::fs::File;
pub struct CacheControlFile(File, String);
impl CacheControlFile {
pub async fn new_cachekey(p: &Path) -> anyhow::Result<Self> {
let tag = p.file_name().unwrap().to_str().unwrap().to_owned();
let f = File::open(p).await?;
Ok(Self(f, tag))
}
pub async fn new_mtime(f: File) -> Self {
let meta = f.metadata().await.unwrap();
let modified = meta.mtime();
let mut h = DefaultHasher::new();
modified.hash(&mut h);
let tag = format!("{:0>16x}", h.finish());
Self(f, tag)
}
}
impl<'r> Responder<'r, 'static> for CacheControlFile {
fn respond_to(self, req: &'r Request<'_>) -> response::Result<'static> {
let Self(file, tag) = self;
if req.headers().get_one("if-none-match") == Some(&tag) {
debug!("file cache: not modified");
Response::build()
.status(Status::NotModified)
.header(Header::new("cache-control", "private"))
.header(Header::new("etag", tag))
.ok()
} else {
debug!("file cache: transfer");
Response::build()
.status(Status::Ok)
.header(Header::new("cache-control", "private"))
.header(Header::new("etag", tag))
.streamed_body(file)
.ok()
}
}
}
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